Crucible-furnace.



No. 644,270 Patented Feb. 27, I900.

R. BAUMANN.

CRUCIBLE FURNACE.

(Application filed Mar. 18, 1899.]

(No Model.)

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Aiiarnvys THE. warns PETERS 00 PHOYO-LITNQ, WASHINGTON, o4 n:v

UNITED STATES PATENT OFFICE.

RUDOLF BAUMANN, OF'OERLIKON, SIVITZERLAND.

CRUCIBLE- FURNACE.

SPECIFICATION forming part of Letters Patent No. 644,270, dated February27, 1900.

Application filed March 18,1899.

T0 (tZZ whom it may concern:

Be it known that I, RUDOLF BAUMANN, a citizen of the Republic ofSwitzerland, and a resident of Oerlikon, near Zurich, Switzerland, haveinvented certain new and useful Improvementsin Orucible-Furnaces,ofwhich the following is a specification.

The object of the present invention is a new and improved means forconveying the blast into a crucible-furnace for the purpose of producinga very high and uniform heat.

The invention is shown in its principal parts 011 the accompanyingdrawings, in which Figure 1 is a vertical sectionthrough the center ofthe furnace. Fig. 2 is a horizontal section through. same on line A A,and Fig. 3 one on line B B of Fig. 1.

In the accompanying drawings, a is a crucible-furnace of square orpolygonal section. The blast is admitted to the interior through a grateb at the bottom. The crucible c rests on it either directly or by meansof a cruciblestand d. The blast entering through the grate tends to passthe furnace in a straight way from the bottom to the top, as indicatedby the arrows I. I

In the corners of the walls forming the shaft of the furnace there areprovided Vertical channels e, closed at their upper ends, butcommunicating at their lower ones with the space underneath the grate.These channels communicate with the interior of the furnace by means oftwyers f, through which the blast ascending the vertical channels getsaccess to the interior of the furnace. These twyers are directedhorizontally and are arranged in different levels one above the other,their number being the same on all vertical channels 6. They arearranged in such a Way that the twyers opening from the same verticalchannel 6 are directed alternately to one side or the other, the twyersof the same level of the different channels being all directedto cause aflow of air in the same direction around the walls of the furnace.

In the accompanying drawings all the lowcst twyers blow, as indicated byarrows II,

$erial 110,709,597. (No model.)

in opposite direction in which the hand of the watch moves. All those ofthe next level blow, as indicated by arrows III, in same direction inwhich the hands of a watch move.

In the third level their direction is the same as in the lowest one, andso on.

By the arrangement hereinbefore described 5 5 a very brisk combustiontakes place throughout the whole furnace, the twyers always fur nishingfresh air also to the higher regions of the furnace. The current of theair entering through the twyers meets the ascending cur- 6o rent atright angles, thereby producing a perfect mixing of the products of thecombustion with fresh air and therefrom a perfect combustion. Even inthe higher levels of the furnace the combustion is as active as in thelower ones, and a perfectly-uniform heat is to be found throughout thewhole shaft of the furnace.

By using a furnace of rectangular cross section square or like cornersare formed, and fromthe air-passages in these corners the air may bereadily discharged in various directions.

What I claim is 1. In combination in a crucible-furnace having a shaftrectangular in cross-section, the grating at the lower part of theshaft, the crucible and the'air-passages in the corners of the shaftwith horizontal twyers extending from the several corners in differentdirec- 8o tions, substantially as described.

2. In combination in a crucible-furnace, the shaft having the corners,the passages located at the corners and having twyers locatedatdifierent levels, those of one level bein g directed to discharge theair in one direction around the shaft and those of the next leveldischarging the air around the shaft in the other direction,substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

RUDOLF BAUMANN.

Witnesses:

A. LIEBERKNEOHT, ELISE EDEL.

